inclined planes

Mt. Pisgah Plane. Length 2,341 ft., 664 ft. high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pisgah Plane. Length 2,341 ft., 664 ft. high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback Railroad. Mt. Jefferson Plane. 19th century Pennsylvania st...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback Railroad, looking down Mt. Pisgah plane.

Picryl description: Public domain image of railway tracks, train station, railroad building, free to use, no copyright restrictions.

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Looking down Jefferson Plane. 19th century Pennsylvania stereoscope ca...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

[Mt. Jefferson Plane. 2070 feet long, 462 feet high.]

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pisgah Plane. 2322 feet long, 864 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback Railroad, looking down Mt. Pisgah plane.

Picryl description: Public domain image of railway tracks, train station, railroad building, free to use, no copyright restrictions.

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback Railroad. Looking down Mt. Pisgah Plane.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pisgah Plane. 2322 feet long, 864 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Lehigh Valley Railroad Company. Looking down Mt. Pisgah. Stereoscope c...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mauch Chunk, Pa. Showing first incline.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mt. Pisgah Plane. 2322 feet long, 864 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback R.R. Looking down Mt. Pisgah Plane.

Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description

Switchback Railroad. Mt. Pisgah plane. 19th century Pennsylvania stere...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pigah Plane. Switchback R.R. 19th century Pennsylvania stereoscope...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mauch Chunk, Pa. Showing first incline.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mauch Chunk, Penn. 19th century Pennsylvania stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Inclined Plane, Cincinnati, Ohio, Vintage Postcard by Detroit Publishi...

Picryl description: Public domain photo of a vintage Ohio postcard, free to use, no copyright restrictions image.

Mt. Pisgah Plane, Switchback R.R. 19th century Pennsylvania stereoscop...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback Railroad, Mt. Pisgah plane. 19th century Pennsylvania stere...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

[Mt. Jefferson Plane. 2070 feet long, 462 feet high.]

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback R.R. Looking down Mt. Pisgah Plane.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Mauch Chunk, Penn. 19th century Pennsylvania stereoscope card.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback Railroad. Mt. Jefferson Plane. 19th century Pennsylvania st...

Mt. Pisgah Plane, Switchback R.R. [railroad].

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Switchback Railroad. Looking down Mt. Pisgah Plane.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Switchback R.R. Looking down Mt. Pisgah Plane.

Public domain image of a train station in Boston, Massachusetts, free to use, no copyright restrictions - Picryl description

Switchback Railroad, Mt. Pisgah plane. 19th century Pennsylvania stere...

Looking down Jefferson Plane. 19th century Pennsylvania stereoscope ca...

Mt. Pigah Plane. Switchback R.R. 19th century Pennsylvania stereoscope...

Switchback Railroad, Mt. Pisgah plane. 19th century Pennsylvania stere...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pisgah Plane. 2322 feet long, 864 feet high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mauch Chunk, Pa. Showing first incline.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Switchback Railroad, Mt. Pisgah plane. 19th century Pennsylvania stere...

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Looking down Mt. Pisgah Plane. - stereoscopic view, public domain phot...

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mauch Chunk, Penn. 19th century Pennsylvania stereoscope card.

Switchback Railroad. Mt. Pisgah plane. 19th century Pennsylvania stere...

Switchback Railroad. Mt. Jefferson Plane. 19th century Pennsylvania st...

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Mt. Pisgah Plane. 2322 feet long, 864 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback Railroad, looking down Mt. Pisgah plane.

Picryl description: Public domain image of railway tracks, train station, railroad building, free to use, no copyright restrictions.

Mauch Chunk, Penn. 19th century Pennsylvania stereoscope card.

Mt. Pisgah Plane. Length 2,341 ft., 664 ft. high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mt. Pisgah Plane. Length 2,341 ft., 664 ft. high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Switchback R.R. Looking down Mt. Pisgah Plane.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Switchback Railroad. Mt. Jefferson Plane. 19th century Pennsylvania st...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Switchback Railroad. Mt. Pisgah plane. 19th century Pennsylvania stere...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pisgah Plane, Switchback R.R. [railroad].

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Switchback Railroad. Looking down Mt. Pisgah Plane.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mauch Chunk, Pa. Showing first incline.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Mt. Pisgah Plane, Switchback R.R. 19th century Pennsylvania stereoscop...

Switchback Railroad. Mt. Pisgah plane. 19th century Pennsylvania stere...

Switchback Railroad. Looking down Mt. Pisgah Plane.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Looking down Mt. Pisgah Plane. - stereoscopic view, public domain phot...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Looking down Jefferson Plane. 19th century Pennsylvania stereoscope ca...

Switchback Railroad, looking down Mt. Pisgah plane.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Mt. Pisgah Plane, Switchback R.R. [railroad].

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Lehigh Valley Railroad Company. Looking down Mt. Pisgah. Stereoscope c...

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mt. Pisgah Plane. 2322 feet long, 864 feet high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mt. Pisgah Plane, Switchback R.R. 19th century Pennsylvania stereoscop...

Lehigh Valley Railroad Company. Looking down Mt. Pisgah. Stereoscope c...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pisgah Plane, Switchback R.R. [railroad].

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pisgah Plane, Switchback R.R. 19th century Pennsylvania stereoscop...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Lehigh Valley Railroad Company. Looking down Mt. Pisgah. Stereoscope c...

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mt. Pigah Plane. Switchback R.R. 19th century Pennsylvania stereoscope...

[Mt. Jefferson Plane. 2070 feet long, 462 feet high.]

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

[Mt. Jefferson Plane. 2070 feet long, 462 feet high.]

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Switchback Railroad, looking down Mt. Pisgah plane.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Public domain scan of the back of stereograph card, stereoscopic view, 19th century, free to use, no copyright restrictions - Picryl description

Switchback Railroad, looking down Mt. Pisgah plane.

Picryl description: Public domain image of the back of stereograph card, stereoscopic view, free to use, no copyright restrictions

Looking down Jefferson Plane. 19th century Pennsylvania stereoscope ca...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pisgah Plane. 2322 feet long, 864 feet high.

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Pigah Plane. Switchback R.R. 19th century Pennsylvania stereoscope...

Picryl description: Public domain image of railroad tracks, railway, train car, free to use, no copyright restrictions.

Mt. Jefferson Plane. 2070 feet long, 462 feet high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More

Mt. Pisgah Plane. 2322 feet long, 864 feet high.

Pennsylvania stereoscopic card. Robert Dennis's stereographs collection includes more than 72,000 stereoscopic views organized primarily by geography. The collection bears the name of the native New Yorker who... More